OligospermiaInfertility, MaleAzoospermiaAsthenozoospermiaSpermatozoaSperm CountSperm MotilityChromosomes, Human, YSemenSpermatogenesisSperm HeadSex Chromosome AberrationsSex Chromosome Disorders of Sex DevelopmentVaricoceleSemen AnalysisMesteroloneTestisAcrosomeSeminal Plasma ProteinsHydrocarbons, BrominatedSequence Tagged SitesKlinefelter SyndromeFertilization in VitroEmbryo TransferAneuploidyY ChromosomeChromosome DeletionFertilityPregnancyIn Situ Hybridization, FluorescenceSperm Injections, IntracytoplasmicKaryotypingChromosome AberrationsTestosteroneSertoli Cell-Only SyndromeProtaminesSpermatic CordPolymerase Chain ReactionEjaculationChromosomes, Human, Pair 18Chromosomes, Human, Pair 21Chromosomes, Human, Pair 13Genital Diseases, MaleChromosomes, Human, XPachytene StageVasectomyAcrosome ReactionUrologic Surgical Procedures, MaleGenetic LociAbnormal KaryotypeSperm-Ovum InteractionsXYY KaryotypeMenCryptorchidismVasovasostomyTesticular DiseasesUreaplasma urealyticumEjaculatory DuctsTunisiaReproductive Techniques, AssistedDNA FragmentationCase-Control StudiesSpermatids